U.S. Time Zones & GMT Offsets

Version Affected: VDI, Desktop and Web

 

Overview

This article lists the U.S. time zones and their Greenwich Mean Time (GMT) offsets, including how each shifts during Daylight Saving Time (DST) -- useful for scheduling, system configuration, and cross-regional coordination.

GMT Offsets by U.S. Time Zone

• Eastern Time -- EST (GMT -5) standard, EDT (GMT -4) during DST
• Central Time -- CST (GMT -6) standard, CDT (GMT -5) during DST
• Mountain Time -- MST (GMT -7) standard, MDT (GMT -6) during DST
• Pacific Time -- PST (GMT -8) standard, PDT (GMT -7) during DST
• Alaska Time -- AKST (GMT -9) standard, AKDT (GMT -8) during DST
• Hawaii Time -- HST (GMT -10); does not observe DST
• Arizona -- MST (GMT -7); does not observe DST

Daylight Saving Time (DST) Period

• Starts: Second Sunday in March (clocks move forward by 1 hour)
• Ends: First Sunday in November (clocks move back by 1 hour)

Special Considerations

DST does not apply in Hawaii or most of Arizona. Always confirm the current DST status when scheduling systems, bookings, or international meetings, and use a reliable tool or API for time conversion to avoid manual calculation errors.


 

SecureAuth Knowledge Base Articles provide information based on specific use cases and may not apply to all appliances or configurations. Be advised that these instructions could cause harm to the environment if not followed correctly or if they do not apply to the current use case.

Customers are responsible for their own due diligence prior to utilizing this information and agree that SecureAuth is not liable for any issues caused by misconfiguration directly or indirectly related to SecureAuth products.